CN101669291A - Method of transmitting data and modem - Google Patents
Method of transmitting data and modem Download PDFInfo
- Publication number
- CN101669291A CN101669291A CN200780051561A CN200780051561A CN101669291A CN 101669291 A CN101669291 A CN 101669291A CN 200780051561 A CN200780051561 A CN 200780051561A CN 200780051561 A CN200780051561 A CN 200780051561A CN 101669291 A CN101669291 A CN 101669291A
- Authority
- CN
- China
- Prior art keywords
- frequency band
- modulator
- predetermined frequency
- notch filter
- trap
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/26265—Arrangements for sidelobes suppression specially adapted to multicarrier systems, e.g. spectral precoding
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
- H04B2203/5416—Methods of transmitting or receiving signals via power distribution lines by adding signals to the wave form of the power source
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
- H04B2203/5425—Methods of transmitting or receiving signals via power distribution lines improving S/N by matching impedance, noise reduction, gain control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5429—Applications for powerline communications
- H04B2203/5441—Wireless systems or telephone
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5429—Applications for powerline communications
- H04B2203/5458—Monitor sensor; Alarm systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5462—Systems for power line communications
- H04B2203/5491—Systems for power line communications using filtering and bypassing
Abstract
A method of transmitting data is presented, comprising: modulating said data onto a plurality of carriers with different carrier frequencies, resulting in a transmission signal; notching predeterminedfrequency bands of said transmission signal, which predetermined frequency bands would otherwise disturb external transmissions; and boosting carriers which are adjacent to said predetermined frequency bands and which would be attenuated because of said notching step. A corresponding modem (200) is presented as well.
Description
Technical field
The present invention relates to a kind of method and a kind of modulator-demodulator that is used to transmit data.
Background technology
Power line communication (PLC) may have interference to fixed radio broadcasting or other external transmission.Today, the PLC modulator-demodulator has the fixed trap filter that is used for amateur frequency band.The filter that is used for fixing trapper can use high the inhibition and extremely steep slope realization.Notion dynamic or intelligent trap allows the PLC modulator-demodulator to detect the inlet in fixed radio broadcasting station.The frequency that has detected radio station will be ignored by PLC.For in the PLC reflector, realizing this operation, can use adaptive notch filter to suppress the transmission signals of predetermined frequency band.These adaptive notch filters also make adjacent or contiguous with described predetermined frequency band carrier wave decay, and this is to have more weak slope because be used for the notch filter of the dynamic inhibition of frequency, particularly when having many independent frequencies will carry out the trap processing.
Summary of the invention
The purpose of this invention is to provide a kind of method and a kind of modulator-demodulator that is used to transmit data, this has strengthened the performance of the adaptive notch filter filtering that is used for the PLC system.
This purpose is solved by a kind of method that transmits data, comprising:
With described data-modulated to a plurality of carrier waves that have different carrier frequency, thereby produce transmission signals;
The predetermined frequency band of described transmission signals is carried out trap handle, described predetermined frequency band otherwise will disturb external transmission; And
Increase (boost) adjacent with described predetermined frequency band and since described trap treatment step with the decay carrier wave.
Aspect another, this purpose is solved by a kind of modulator-demodulator, comprising:
A plurality of modulators, each is configured to the input data-modulated to one of a plurality of carrier waves;
A plurality of amplifiers, each is connected to one of described a plurality of modulators;
Converter unit is connected to described amplifier and is configured to calculate summation from the signal of each described amplifier to generate transmission signals;
Notch filter is connected to described converter unit, and described notch filter is configured to the predetermined frequency band of described transmission signals is carried out the trap processing;
The trap control unit is connected to described notch filter, and is connected to described amplifier, and described trap control unit is configured to adjust the magnification ratio corresponding to the described amplifier of described predetermined frequency band.
Description of drawings
From the following description of in conjunction with the accompanying drawings currently preferred embodiments of the invention, will more understand above and other objects of the present invention, characteristic and advantage, wherein
Fig. 1 illustrates the frequency spectrum of the signal of the transmission that has a plurality of trappers,
Fig. 2 illustrates the block diagram of the modulator-demodulator that has adaptive notch filter schematically; And
Fig. 3 illustrates the block diagram of the characteristic of the method that is used to transmit data schematically.
Embodiment
For realizing notch filter flexibly, used infinite impulse response (IIR) filter.Corresponding filter construction is realized regularly with hardware mode.During operation with filter coefficient programming (program).After the corresponding measuring unit of antenna and modulator-demodulator carries out the inlet detection of wireless radio service, perhaps by locate to try to find out noise inlet, the sunken filter quantity that decision will realize and the frequency band that will carry out the trap processing at the power supply (main) of powerline systems.Hardware filtering device structure is all general for all filter frequencies and filter bandwidht.Usually, this universal filter has weak slope, and the vicinity or the adjacent carrier of OFDM (OFDM) scheme used in the PLC modulator-demodulator of decay.
Fig. 1 illustrates an example of the transmission spectrum of transmission signals, wherein, some flexibly notch filter omitted some frequencies.Former power spectral density (PSD) should be that the resolution bandwidth (ResBW) by 1kHz is measured-40dBm.For example, in Fig. 1, approximately 10.2MHz should have-the transmission PSD of 40dBm to the frequency of 11MHz.Owing to the avris at the notch filter at 9.5MHz and 11.7MHz place suppresses reason, greatly about 10.2MHz to the communication spectrum of the 11MHz 10dB or more that decayed.
By means of modulator-demodulator 200 as shown in Figure 2, can be at OFDM carrier wave amplify, increase or predistortion weak slope at least about and notch filter decay their the same amount of about 10MHz to 11MHz carrier frequency place.In this embodiment, the carrier wave of all transmission will have identical power spectral density.This has improved the signal to noise ratio (snr) at the receiver place, and allows to use at the Adaptive OFDM system place the higher constellation of the carrier wave that relates to.
In Fig. 2, the OFDM part of modulator-demodulator 200 is shown schematically, wherein, the amplitude of carrier wave can be adjusted separately.Effective load data is sent to feedforward error correction (FEC) unit 202.Afterwards, plural n corresponding quadrature modulator (QAM) 204_1,204_2,204_3 ..., 204_n with the information mapping of each bit to its multiple constellation point.Each quadrature modulator (QAM) 204_1,204_2,204_3 ..., 204_n be connected to plural n amplifier 206_1,206_2,206_3 ..., one of 206_n, and the corresponding carrier wave of a plural n carrier wave multiply by the amplitude factor of described amplifier.The known carrier wave that will carry out the trap processing can become in this stage and be suppressed, and does not inject summation.In converter unit 208, with all active carriers additions, and in time domain, generate transmission signals in promptly contrary fast fourier transform (IFFT) unit.Because the weak avris loop of ofdm system suppresses (side loopsuppression) reason, this signal will be by notch filter 210 other filtering flexibly, and carry out digital-to-analogue conversion by digital to analog converter (DAC) 212 afterwards, and be sent to corresponding receiver (not shown).
The illustrated embodiment of ofdm system can be provided with the amplitude of each carrier wave separately.This can by will corresponding QAM mapper 204_1,204_2,204_3 ..., each the influenced carrier wave after the 204_n multiply by its amplitude factor and realizes.This multiplication increases carrier wave or amplify the identical or at least about identical amount of attenuation with this carrier wave that is produced by notch filter flexibly 210.The value of the decay of each carrier wave that is produced by notch filter flexibly 210 can draw from the frequency response of notch filter 210 flexibly.
This embodiment guarantees that carrier wave is increased to its former (not decay) level.Therefore, the magnification ratio that exceeds the PSD that regulates restriction can be avoided.
Provide be connected to flexibly notch filter 210 and amplifier 206_1,206_2,206_3 ..., the trap control unit 214 of 206_n, trap control unit 214 is configured to be provided with the filter factor of notch filter 210 flexibly, the frequency response of calculating filter 210, and by the carrier wave that corresponding amplitude factor increases or amplify decay is set.Trap control unit 214 can be connected to antenna 216 and corresponding first measuring unit 218 to determine for example frequency band of external transmission on the shortwave channel, for example, resembles the radio ham band or from the wireless radio transmission of radio station.Also another embodiment shown in figure 2 comprises another measuring unit 220, and this configuration of cells is to try to find out noise inlet on power supply 222 so that determine described frequency band.Modulator-demodulator 200 can comprise antenna 216 and first measuring unit 218 and/or by using the another measuring unit 218 of the alternative or combination that broken line illustrates schematically.
These frequency bands of measuring can be used for determining accordingly the described filter factor of described notch filter flexibly 210, so that the counterpart of transmission signals is carried out the trap processing, and correspondingly adjust corresponding amplitude factor.
In Fig. 3, the block diagram of the method that is used to transmit data is shown schematically.In first step S1, measure the noise inlet and detect the frequency band that should carry out the trap processing.In the second step S2, calculate the filter factor that is used for notch filter 210, and the response of the respective frequencies of definite notch filter 210.In third step S3, assess the decay of the employed adjacent carrier that frequency response thus causes, and in step S4 pair amplifier 206_1,206_2,206_3 ..., 206_n programmes to increase carrier wave.
Reference number
200 modems
202 forward error correction unit
204_1,204_2, quadrature modulator QAM
204_3，...，204_n
206_1,206_2, amplifier
206_3，...，206_n
208 contrary fast Fourier transform unit
210 notch filters flexibly
212 digital to analog converters
214 trap control units
216 antennas
218 measuring units
220 another measuring units
222 power supplys
The S1 first step
S2 second step
The S3 third step
S4 the 4th step
Claims (10)
1. method that transmits data comprises:
With described data-modulated to a plurality of carrier waves that have different carrier frequency, thereby produce transmission signals;
The predetermined frequency band of described transmission signals is carried out trap handle, described predetermined frequency band otherwise will disturb external transmission; And
Increase adjacent with described predetermined frequency band and since described trap treatment step with the decay carrier wave.
2. the method for claim 1, wherein
To disturb external transmission by which frequency band of assessing described transmission signals, pre-determine the described predetermined frequency band of described transmission signals.
3. method as claimed in claim 1 or 2 also comprises:
Be identified for the attenuation of described adjacent carrier;
Described carrier wave is increased described definite amount.
4. as each described method of claim 1 to 3, also comprise:
Measure the frequency band of external transmission;
Described predetermined frequency band is adjusted into the described frequency band of measuring; And
Make the described adjacent carrier wave of predetermined frequency band that increases step adaptation and described adjustment.
5. modulator-demodulator (200) that is used to transmit data comprising:
A plurality of modulators (204), each described modulator configuration are will import data-modulated to one of a plurality of carrier waves;
A plurality of amplifiers (206), each described amplifier is connected to one of described a plurality of modulator (204);
Converter unit (208) is connected to described amplifier (206) and is configured to calculate summation from the signal of each described amplifier (206) to generate transmission signals;
Notch filter (210) is connected to described converter unit (208), and described notch filter (210) is configured to the predetermined frequency band of described transmission signals is carried out the trap processing;
Trap control unit (214) is connected to described notch filter (208), and is connected to described amplifier (206), and described trap control unit (214) is configured to adjust corresponding to described predetermined frequency band the described magnification ratio of described amplifier.
6. modulator-demodulator as claimed in claim 5 (200), wherein
The described magnification ratio that described trap control unit (214) is configured to fall into the carrier wave in the described predetermined frequency band is adjusted into zero.
7. as claim 5 or 6 each described modulator-demodulators (200), wherein
Described trap control unit (214) is configured to make the described magnification ratio adaptation of the carrier wave adjacent with described predetermined frequency band to approximate described adjacent carrier greatly because the amount of the attenuation of described notch filter (210) reason.
8. as claim 5 or 7 each described modulator-demodulators (200), also comprise:
Antenna (216) and being used to is measured the corresponding measuring unit (218) of the frequency band of external transmission; And
Wherein said trap control unit (214) is configured to adjust described notch filter (210) and handles the frequency band that falls into the described transmission signals in the described frequency band of measuring is carried out trap, and is configured to make the amount of described magnification ratio to adapt to the described adjustment of described notch filter (210).
9. as claim 5 or 8 each described modulator-demodulators (200), also comprise:
Another measuring unit (200), the power supply (222) that is configured to measure powerline systems is gone up the frequency band of noise inlet; And
Wherein said trap control unit (214) is configured to adjust described notch filter (210) and handles the frequency band that falls into the described transmission signals in the described frequency band of measuring is carried out trap, and is configured to make the amount of described magnification ratio to adapt to the described adjustment of described notch filter (210).
10. as each described modulator-demodulator (200) of claim 5 to 9, wherein
Described converter unit (208) is built as contrary fast Fourier transform unit.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP07003693.4 | 2007-02-22 | ||
| EP07003693A EP1962438A1 (en) | 2007-02-22 | 2007-02-22 | Method of transmitting data and modem |
| PCT/EP2007/007753 WO2008101523A1 (en) | 2007-02-22 | 2007-09-05 | Method of transmitting data and modem |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101669291A true CN101669291A (en) | 2010-03-10 |
| CN101669291B CN101669291B (en) | 2013-08-21 |
Family
ID=38141144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007800515612A Expired - Fee Related CN101669291B (en) | 2007-02-22 | 2007-09-05 | Method of transmitting data and modem |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US8401062B2 (en) |
| EP (1) | EP1962438A1 (en) |
| KR (1) | KR101387269B1 (en) |
| CN (1) | CN101669291B (en) |
| BR (1) | BRPI0721317A2 (en) |
| RU (1) | RU2449487C2 (en) |
| WO (1) | WO2008101523A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105637792A (en) * | 2013-10-11 | 2016-06-01 | 高通股份有限公司 | Dynamic transmit power and signal shaping |
| US9608696B2 (en) | 2013-10-11 | 2017-03-28 | Qualcomm Incorporated | Dynamic transmit power and signal shaping |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1643658A1 (en) | 2004-10-04 | 2006-04-05 | Sony Deutschland GmbH | Power line communication method |
| EP2020758A1 (en) * | 2007-08-01 | 2009-02-04 | Sony Corporation | Method for transmitting a signal over a power line channel and power line communication modem |
| CN102714521B (en) | 2009-10-26 | 2015-11-25 | 索尼公司 | For the device of electric line communication system, electric line communication system and power line communication method |
| TW201445939A (en) * | 2013-02-15 | 2014-12-01 | Sony Corp | OFDM encoding apparatus and method |
| US9509371B2 (en) * | 2013-09-19 | 2016-11-29 | Enphase Energy, Inc. | Method and apparatus for power line communications distortion compensation |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL103620A0 (en) * | 1992-11-03 | 1993-04-04 | Rafael Armament Dev Authority | Spread-spectrum,frequency-hopping radiotelephone system |
| US5703908A (en) * | 1993-10-08 | 1997-12-30 | Rutgers University | Fixed reference shift keying modulation for mobile radio telecommunications |
| US5930301A (en) * | 1996-06-25 | 1999-07-27 | Harris Corporation | Up-conversion mechanism employing side lobe-selective pre-distortion filter and frequency replica-selecting bandpass filter respectively installed upstream and downstream of digital-to-analog converter |
| US5960040A (en) * | 1996-12-05 | 1999-09-28 | Raytheon Company | Communication signal processors and methods |
| JP3110333B2 (en) * | 1997-01-23 | 2000-11-20 | 埼玉日本電気株式会社 | Transmit diversity circuit for TDMA wireless device |
| US6201452B1 (en) * | 1998-12-10 | 2001-03-13 | Ericsson Inc. | Systems and methods for converting a stream of complex numbers into a modulated radio power signal |
| JP4289744B2 (en) * | 1999-11-05 | 2009-07-01 | アンリツ株式会社 | Signal generator |
| US6525857B1 (en) * | 2000-03-07 | 2003-02-25 | Opvista, Inc. | Method and apparatus for interleaved optical single sideband modulation |
| EP1162803A1 (en) * | 2000-06-05 | 2001-12-12 | Telefonaktiebolaget L M Ericsson (Publ) | Frequency tracking device and method for a receiver of a multi-carrier communication system |
| US8077795B2 (en) * | 2005-10-03 | 2011-12-13 | Telefonaktiebolaget Lm Ericsson (Publ) | Apparatus and method for interference mitigation |
| EP2020758A1 (en) | 2007-08-01 | 2009-02-04 | Sony Corporation | Method for transmitting a signal over a power line channel and power line communication modem |
-
2007
- 2007-02-22 EP EP07003693A patent/EP1962438A1/en not_active Withdrawn
- 2007-09-05 BR BRPI0721317-4A2A patent/BRPI0721317A2/en not_active Application Discontinuation
- 2007-09-05 WO PCT/EP2007/007753 patent/WO2008101523A1/en active Application Filing
- 2007-09-05 US US12/524,878 patent/US8401062B2/en active Active
- 2007-09-05 KR KR1020097017472A patent/KR101387269B1/en active IP Right Grant
- 2007-09-05 RU RU2009135265/08A patent/RU2449487C2/en active
- 2007-09-05 CN CN2007800515612A patent/CN101669291B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105637792A (en) * | 2013-10-11 | 2016-06-01 | 高通股份有限公司 | Dynamic transmit power and signal shaping |
| US9608696B2 (en) | 2013-10-11 | 2017-03-28 | Qualcomm Incorporated | Dynamic transmit power and signal shaping |
Also Published As
| Publication number | Publication date |
|---|---|
| BRPI0721317A2 (en) | 2014-02-18 |
| WO2008101523A1 (en) | 2008-08-28 |
| US20100027600A1 (en) | 2010-02-04 |
| KR101387269B1 (en) | 2014-04-18 |
| RU2009135265A (en) | 2011-03-27 |
| CN101669291B (en) | 2013-08-21 |
| US8401062B2 (en) | 2013-03-19 |
| EP1962438A1 (en) | 2008-08-27 |
| KR20090115159A (en) | 2009-11-04 |
| RU2449487C2 (en) | 2012-04-27 |
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Granted publication date: 20130821 Termination date: 20210905 |